Hello, guys so I today bought a Tektronix 475A for $40 but it got problems that make me regret buying. so here a list of problems, and please help me out with fixing it.
1 - Back fan supper load for no reason.
2 - aligning the horizontal axis is really broken like if I try to align, it will jump across and will make a really small change. and with that, it will jump back and forward if u don't find a good spot and that good spot is still very good.
3 - I can't seem to get a clear view, I do focus but it doesn't help much, and as u can see in the picture the square wave is really not clear, u can only really see the top and bottom.
4 - whenever I change the time per division knob, the signal starts to double and I cant get a single clear signal, i need to find a perfect division spot for it to not double.